Joseph.T.F, L. et al. 2013. Prevalence and Associated Factors of Intention to Participate in HIV Voluntary Counseling and Testing for the first Time Among Men Who Have Sex With Men iin Hongkong, China, Preventive Medicine. Elsevier Inc., 57(6), pp. 813818. doi: 10.1016/j.ypmed.2013.09.005.